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3 Enhanced title.
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Does any "onea “one-fits-all"all” file format exist, or should I offer multiple fileebook formats?

2 Replaced "reference-request" tag with "publishing" tag as that makes more sense.
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    Tweeted twitter.com/#!/StackEbooks/status/420800971674243072
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Does any "one-fits-all" file format exist, or should I offer multiple file formats?

I want to publish my first e-book, but the multitude of available file formats (PDF, ePUB, MOBI, TXT, etc.) is a bit overwhelming. As a result, I am not really sure which format (if any) would be able to reach most readers.

Before I opt-in to simply offering multiple file formats (and let individual readers choose what fits their needs best), I would like to know if there is any "one-file-format-fits-all-ebook-readers" file format.

Does any "universally agreed-upon standard file format" for ebooks exist, that most (if not all) ebook readers are able to handle?